对目前中国的情况而言，我们没有很多瓣膜病的患者。
As for the situation in China, we don't have a lot of valvular disease patients.
正常过滤时在系统未滤介质压力的作用下，滤袋也形成一个多瓣形截面的柱形空腔。
During the process of normal filtration, with the system pressure of the unfiltered media, the filtering bag also turns into a multi-valvular sectional cylindrical empty cavity.
正常过滤时在系统未滤介质压力的作用下，滤袋也形成一个多瓣形截面的柱形空腔。
During the process of normal filtration, with the system pressure of the unfiltered media, the filtering bag also turns into a multi-valvular sectional cylindrical empty cavity.
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